SHARP SP1702 Technical Report

Date: Mar. 16, 1994

COPIER : SF-2022

CHANGE IN ROM OF THE MAIN PWB (TROUBLE SHOOTING WHITE OUTS AT THE BACK EDGE OF B5R, A4R (LETTER - R) COPY PAPERS)

1.Model name: SF-2022 / 2027

2.General: A change in the ROM (Ver 6.03) was reported in T/R SP-1658. When copy paper was

fed from the top paper cassette of the machine, white outs sometimes occurred in B5R and A4R (Letter - R) copy papers. (This problem has not occurred when copy paper was fed from other paper cassettes.) To alleviate this problem corrections have been carried out on the software.

No. : SP-1702

3.Cause: In addition to changes in the H trouble detection method and jam count trouble, trouble shooting of wrinkles that were occurring at the leading edge of the image was carried out for B5R and A4R (Letter - R) copy papers by changing the software so that the copy papers were pushed from behind by the feeder roller when the papers entered the register rollers. When the copy paper was fed from the top paper cassette of the machine, however, the copy paper was bent too much and “Z-folds” occurred, causing white outs to occur in the rear ends of the copies. (this problem did not occur when copy paper was fed from other cassettes, and occurred most frequently with thin copy paper.)

4.Description: The trouble shooting measures for the wrinkles occurring at the leading edge of the image that were carried out for B5R and A4R (Letter - R) copy papers have been abbreviated. In accordance with this change in the software, the software Ver number has been changed from Ver 6.03 to Ver 6.04.

Note: The problem described above has occurred only when B5R and A4R (Letter - R)

copy paper is fed from the top paper cassette of the machine when using ROM Ver 6.03. The problem has not occurred when ROM versions other than Ver 6.03 are used, or when copy paper is fed from paper cassettes other than the top paper cassette of the machine.

5.Action: (Factory action)

From 1994 January production.

SHARP CORPORATION Reprography Division

1/2

Green

Ref.

No.

Model

name

Version P/G No.

Current parts New parts

Parts code Parts code

Price

rank

Parts name

Effec-

tive

time

Inter-

change-

ability

Note

32 -67

SF-2022

2027

1. Interc ha ng ea bl e. 4. N ot i nt er ch an ge ab l e.

2. Current type can be used in place of new type. New type cannot be used in place of current type.

3. Current type cannot be used in place of new type. New type can be used in place of current type.

Parts marked with “ ” is important for maintaining the safety of the set. Be sure to replace these parts with

speci fi e d on es for m aintaini ng t he s a fe ty an d pe rformance of the set.

All

9-4

32 -901

VHI27C01020FC VHI27C01024FC AY ROM (Ver 6.04)

’94/1

CPWBN0928FC58 CPWBN0928FC59 CA Main PWB 6

5. Interchangeable if replaced with same types of relate d parts in use .

6. Others .

See T/R

SP-1658

2/2